class_docstr: Environment for PTL training on a Ray cluster.
class_docstr_tok: ["Environment","for","PTL","training","on","a","Ray","cluster","."]
docstr: The main address through which all processes connect and communicate.
docstr_tok: ["The","main","address","through","which","all","processes","connect","and","communicate","."]
code: def main_address(self) -> str:
      """The main address through which all processes connect and communicate."""
      return os.environ.get("MASTER_ADDR", "127.0.0.1")
  
file_path: BigDL/python/nano/src/bigdl/nano/deps/ray/ray_envbase.py
imports: import os
  from pytorch_lightning.plugins.environments import ClusterEnvironment
  from pytorch_lightning.utilities import rank_zero_only
label_desc: Use image node_id 3 for calling the RayEnvironment obj's underlying member method code with example usage: obj.main_address() and returns: os